A) Warped rotors B) anti-lock braking system operation C) Both A and B D) None of the above Both A and B Which of the following can cause brake system dragging? See less 79 RC bought from original owner in 2006 Excessive Push Rod Length The brake system in your car contains numerous components, each of which plays a distinct role in braking. What do you think the problem might be? If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. An intermittent noise when braking lightly, as in the video below, could also be related to an uneven surface on the rotors. a. Find out what these noises mean and what might fix them. So im getting drag on my front brakes, both sides, after i drive it about 15-20 miles i jack up the front end the the wheels are real tight to spin by hand and you can hear the pads screeching against the rotor. When the brakes are applied, brake fluid is pumped from the master cylinder to the calipers in order to expand the caliper piston and slow the vehicle. Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake system. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. When you are in a crisis situation like a brake problem, some mechanics will take advantage of the customer and over-sell the work that really needs to be done. B only The ABS and TRACTION OFF indicator lights stay on while the engine is running. Correct answer D-The metering valve controls the pressure to the front disc brakes on a combination system and if defective can allow too much pressure causing a lock-up. After that, fixing it is often easy with the help of your Haynes manual. A vehicle with 4-wheel disc brakes has a brake squeal. If this is your problem, then the fix is to resurface the rear drums or replace them. Sketch each of your designs. A check valve that is faulty can also let vacuum bleed out. variable hours is outside the range 0 through 80. Technician B says the cause is a faulty residual pressure check valve admitting air. A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. Replace the brake linings Unusual brake pedal feel. This problem could be caused by a bad: The two main types of disc brake calipers are: The disc brake caliper is attached to the, Sliding calipers have pistons that are positioned on, bleed air or vacuum from the power booster, Brake bleeder screws enable all of the following tasks to be performed EXCEPT. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. The other three answers can lead to a low brake pedal. If it the booster, check valve, or vacuum hose is bad, it will likely also cause a vacuum leak and rough engine idle as well, but an engine with a bad valve or head gasket can also cause low vacuum which can effect the brake boost. There are four types of brake fade. a. Brake failure is common if the fluid leaks out of the system. A only Brake Chatter: Warped or improperly finished rotors will cause this noise. Search by Part Number(s), Keywords, or VIN, Chevy Brake Problems: Common Issues and How to Fix Them, How to Program Chevy Silverado Key Fob Remote, How to Reset Your Chevy or GMC Oil Change Light, How to Unlock Your Chevy or GMC Radio for Free, How to Update Chevy and GMC Navigation Units. Technician A believes it's a defective proportioning valve issue. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. c. Parking brake out of adjustment A. B only Technician B says insufficient clearance between the pads and caliper slider could be the cause. This drag happens with drum brake systems as the springs wear or become rusty. c. Excessive brake pedal travel Soft Pedal- The brake pedal is easy to push but there is less braking. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. If every time you apply your brakes, your brake pedal pulses up and down, the problem is usually caused by the rotors being warped or out of true. The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. The brakes of large trucks are different. You shouldn't waste your valuable time trying to rebuild it. measure the pad-to-caliper piston clearance. The star adjuster should be adjusted until there is a slight drag on the drum. Excessive brake drag Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. Which of the following conditions can cause brake pedal fade? Answer: There are a few options to look at here. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. Fear of the unknown causes anxiety. a. Technician A says the master cylinder pushrod adjustment is incorrect. b. D. Brake pedal pulsation. Technician A says excessive rotor run out could be the cause. B only b. A only The steering wheel vibrates all the time and always veers to the left. If your brakes squeak and you want to know why, maybe I can help! Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. The first thing you should do is check your brake fluidlook in your owner's manual to see how. C. Both technicians Additionally, brake dragging can also be caused by frozen emergency brake cables as well as overextended self-adjusters. Who is right? If it is too worn, you must replace it. The other choices do not affect this concern. To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. There are different causes for brake drag. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Correct answer A-Technician A is right because if the master cylinder pushrod is too short that will be a delay in application. Residual check valve Fluid will not run from the master cylinder while you remove it. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. D. Neither technician. A only Intermodal equipment providers must maintain or cause to be maintained, records for each unit of intermodal equipment they tender or intend to tender to a motor carrier. Brake pad friction materials may be manufactured from any of the following EXCEPT: makes a noise if the brake pads are due to be replaced. This valve basically allows the rear drums to apply first in the system. Correct answer D-The leak must be repaired before the linings are replaced. d. Neither A nor B. The same factors can cause cable operated parking brakes to jam up as well, requiring a replacement of the parking brake cable. You will find the booster between the master cylinder and the firewall in your engine compartment. c. Both A and B The ABS (antilock brake system) amber light does not go off after the engine is started. 3 Basic Kinds of Valves in a Non-ABS System. Correct answer B-This is the standard process by many OEMS when a new rotor is installed. Always replace components with genuine GM parts to avoid premature failure of brake system components. initial cost Brake dust is best removed from brake components on the vehicle by using: If a retracting tool is not available, which of the following can be used to retract the pistons in a caliper with non-integrated parking brakes? If you work by process of elimination, starting with the most likely cause and working through to more complex issues, you can easily diagnose the problem yourself. Brake fade is when the brake fluid is contaminated, so it causes a soft brake pedal, air in the lines, leaking master cylinder, frozen or seized caliper pins or piston, worn out pads, and glazed rotors. We and our partners use cookies to Store and/or access information on a device. The caliper can also freeze up if the caliper slide pins have lost lubrication because they have not been maintained properly. Most braking systems work on a diagonal braking design for safety reasons; that is, the left front and right rear brakes work together and so do the right front and left rear. DOT 3 brake fluid should not boil until it gets above 400 degrees Fahrenheit, but old brake fluid that has absorbed water can boil at as little as 284 degrees, which is why it needs to be changed every other year. A. To get a sense of the scale of the energy, if we were to use this energy to create electron-positron pairs, approximately how many pairs could we create? Check out the system to make sure that you do not have a caliper leak or an oil leak. A only A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. b. If the brake drum is machined beyond its limit the contact surface is further from the brake shoes and they move outward to maintain contact with the drum, causing the brake pedal to drop toward the floor as additional brake fluid moves into the hydraulic system. Replace the defective part. Technician A Poor stopping Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. Excessive Brake Travel: If the brake linings are worn, the drum brakes are misadjusted or the brake lines have air in them, you will have this issue. Always use OEM recommended clips and anti-squeal shims. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. Recently it takes longer to stop and I really have to put a lot of pressure on the brake pedal to come to a complete stop. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. During brake application pressure is high enough to bypass the kink, but when the brake pedal is released, the spring pressure of the master cylinder is not sufficient for the pressure to bypass the kink. Failure of lateral runout or thickness variation checks A brake hose problem like this can take two forms. Most modern brakes have rotors; older ones have drums, especially in the rear. A. Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. Brake pads are being replaced on a vehicle with four-wheel disc brakes. When you remove the master cylinder, you must take all these steps EXCEPT: Correct answer D-Draining the master cylinder isn't required. You can resurface the rotors if they are still thick enough. Correct answer D-Both technicians are wrong. Technician B The brakes on quick take up systems use the same bleeding procedure as those without this valve. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? All modern cars come with sophisticated antilock braking systems (ABS) and brake based stability control, which complicates some aspects of troubleshooting and repair, but those systems will inform you when there is a problem and default to the old, simple system. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? c. Low brake fluid Brake drag is caused by the brake pads or shoes not releasing completely when the brake pedal is released. I changed the brake pads, but that didn't help much. b. The ABS warning light usually comes on when there is this type of problem. Replace them if you see that they have oil, fluid or grease on them. For drum brakes, a 10 lb. Tech B says that the faster a vehicle moving, the more braking power is needed. The lens-maker's equation has three design parameters. a. C. Dragging brakes It also expands when subjected to high pressures. Situations such as heavy loads or long downhill grades where the brakes are used heavily can lead to overheating of the lining, drums, or brake fluid, resulting in a loss of braking called: Which brake is used for holding a vehicle in place when its stationary? You notice brake fluid in the engine. A pull when braking may also have nothing to do with brakes. A spongy brake pedal may be caused by: Object A has mass mA=7kgm_{A}=7 \mathrm{kg}mA=7kg and initial momentum pA,i=17,5,0kgm/s,\vec{p}_{A, i}=\langle 17,-5,0\rangle \mathrm{kg} \cdot \mathrm{m} / \mathrm{s},pA,i=17,5,0kgm/s, just before it strikes object B, which has mass mB=11kg.m_{B}=11 \mathrm{kg}.mB=11kg. As rotors age, they go through the heating and cooling process thousands of times, so it's inevitable for them to lose their shape or trueness. Correct answer B-Having a seized caliper piston leads to a high pedal. Most instances of a hard pedal come down to a failure in the power boost system, whether vacuum based or hydro-boost (used mostly on diesels, we won't be covering it here). This article also includes a repair technique for noisy drum brakes that I found by trial and error. Lubricate slide pins on disc brakes to prevent brake drag and binding. Technician A says to check the TCS and ABS diagnostic trouble codes. a. If a 40 kg person is accelerating at 10m/s^2, then the magnitude of the force acting on him or her is 400 N. Write a C++ statement that prints the message The number is not valid. if the B. This leads to the brakes dragging. 1. Who is right? A stuck brake caliper can cause the pads to be pressed against the rotor while driving. Glazed brake pads result from excessive heat. c. Seized caliper piston on the other side It's also possible to check the blink codes with the DLC. d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. C. pumping the brake pedal 25 times with the ignition switch off Here is the list of possible causes: Service and parking brake adjustment Rear brake hardware Shoe lands or bosses GM clip in wheel cylinders Brake drum condition Brake shoe contamination Brake valving Friction material . Low Brake Pedal:This can occur if the rear drum brake shoe adjusters happen to be rusted or sticking. The fix for this brake problem is simple: resurfacing the rotors, if they are still thick enough (see section 3 above), or replacing them if they are not. Who is right? Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. However, it can also be due to fluid loss or a low fluid level. An often-misdiagnosed cause of pull is a collapsed brake hose. What is the cause? Technician A says a defective proportioning valve could be the cause. Who is right? Some of the cause of brakes dragging on one or more wheels can be: A seized caliper or brake pads that have become jammed in the caliper is probably the most common failure of this type, and can occur due to age, rust, and salt used on winter roads. Correct answer A-The defective check valve causes a loss in vacuum when the engine is off. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. That way, if there is a leak in one part of the system, it should only affect one front brake and one rear brake. Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. a. If you are trying to bring a project car back to life, but can't get it to roll, chances are this is the problem. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Which of the following can cause brake pedal pulsation? B only Typically rusted rotors or drums only happen when a car has been sitting for a long period. b. 505050 One safe way to test whether a braking problem is at the front or rear brakes is to drive at a low speed and: (7.1.2) * low brake fluid All of the following can cause brake pedal pulsation, EXCEPT internal master cylinder leak All of the following can cause brake system dragging, EXCEPT fixed and sliding Consider a system consisting of both objects A and B. Frozen caliper piston A better idea of where the master cylinder is located in relation to the brake pedal. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. a. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. Low or uneven tire pressure can cause a pull. b. A bad master cylinder can introduce air into the lines, as can a failure at a caliper or wheel cylinder. Answer: Is your abs light on? You should put new pads on your Chevy and replace or repair the rotors. Technician B believes there is an issue with the lateral runout of the rotor. B only If the piston is stuck, and the fluid pressure can't push it back into the bore easily, the pressure on the pads will be uneven and the car will pull. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. Push and hold the release button on the end of the emergency brake handle; this is so the emergency brake does not lock into place and can be released easily. The brakes can fail if your hydraulic system or master cylinder is leaking. The ABS is what kicks the brake pedal back, so most likely it has something to do with the ABS system. What's more, I'll teach you to fix it in either case. Brake rotors need to be refinished under all of these conditions EXCEPT: 2320, what is the phase relationship between A vehicle has a very erratic brake pulling concern while applying the brakes. Which of the following is the proper procedure? Then, it needs to be backed off until the wheel begins to spin freely. c. Both A and B Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. You should clean or replace the adjusters to eliminate the problem. d. Neither A nor B, A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. I replaced the brake pads again, both calipers and rotors. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. C. Installation of a new brake rotor You need a scan tool to read the code. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Who is right? B. If you do, it could be a matter of minutes until you smash into something. Even when everything is working properly with your brakes, and nothing is worn out, they can suddenly start making disconcerting noises or develop a shudder under use. Brake adjustment The pictures below show the master cylinder under the brake pedal. Answer: No, you should really look for a new mechanic, pads maybe if you drive a ton of miles in stop and go traffic or you're a mail carrier, lines are rarely replaced. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. Again, you will have to measure the drums to determine if they can be resurfaced or not. A only The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. A only Question: What makes a car's disc brakes drag hard after a 15-minute drive? When the brake pedal gets soft or sinks to the floor, it's generally due to a leak in the braking system, most commonly the master cylinder leaking internally or externally. Bleed the brake lines as recommended by Chevy to fix this. All of these might lead to a low brake pedal, EXCEPT: Brake dragging is commonly caused by broken or weak springs on the drum brakes. For the compressor linkage, at the instant shown, the crank is rotating counterclockwise at 2000rpm2000 \mathrm{rpm}2000rpm and accelerating at 10,000rad/s210,000 \mathrm{rad} / \mathrm{s}^210,000rad/s2. Then, it should be backed off until there's a drag on the wheel. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. d. Brake light is illuminated. b. VAV_\text{A}VA and I2I_2I2? A only d. Steering gear problem. 7. Note: I dont recommend pulling up on the emergency brake handle at high speeds, it can cause your rear brakes to lock up and send the vehicle into a spin causing death or serious injury! a. with the engine off Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. d. Fluting. Vacuum Pressure Vacuum - or really lack of vacuum pressure - is the most common cause of a hard brake pedal, and therefore the first thing to look at when a hard pedal is present. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. A slight gap should be present between the pushrod and the master cylinder. On some vehicles, disc brakes are equipped with a steel scratcher that: Brake pad wear indicators may be either mechanical or: Which tool is used to measure the useful life of brake linings? _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. Be sure to remove the pad shims from the caliper and check for any rust under the shims as rust can cause the pads to bind. Check and make sure there is free play at the top of the brake pedal after driving and braking for a while, if there is no free play, something is out of adjustment. Which of the following would NOT cause a disc break to drag? Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Question: Does an emergency brake in a car not work after an accident? Excessive tire pressure First, it can act like a restrictor in the line. In this article, I will explain the most common reason for a slipping automatic transmission and the most common reason for a slipping standard transmission. One safe way to test whether a braking problem is at the front or rear brakes is to drive at a low speed and: (7.1.2) *, All of the following can cause brake pedal pulsation, EXCEPT, All of the following can cause brake system dragging, EXCEPT. Continue with Recommended Cookies. On a car with a drum/disc system, the front brakes lock up on light pedal application. b. To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Which of the following can cause brake system dragging? Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. Brake drum machined beyond its limit The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Who is correct? The other brake pad is slightly worn. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. The other three answers can lead to a low brake pedal. a. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. D. loosening the front wheel bleeder screws with the ignition switch on. a. That bleeds out any vacuum. There are only about nine evil mechanics in the world, they just move around a lot! b. If your rear drums are the cause of the brake pulsation, you will feel the pulsation at this time, and the car will shake when the emergency brake is applied. All the other answers could occur. Modern cars use a power assist (vacuum or otherwise) hydraulic system, with disc brakes on the front wheels, and discs or drums on the back. B. What do you think it might be? On ABS vehicles, the ABS pump or the high-pressure accumulator can be the cause of power loss. This can be due to oil, grease or fluid on a pad, a caliper that is stuck, brake line blockage, or wheel bearings that are loose. You can do this test if your emergency brake handle is near the center console and it is the style that you pull up with your hand. b. with the engine running a. You don't need to do anything different. Brake problems can be daunting if you don't know what's causing them. C. Both technicians The master cylinder, where it attaches to the brake pedal. Technician B says that the star wheel assembly should be lubricated on the floating end. C. 200200200 Who is right? d. Neither A nor B. Technician A is wrong because recalibration is not required for these sensors. Question: I had problems with my brakes grinding and pulling to the right when braking. c. Both A and B b. The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. Pulsation:This is the symptom of a brake rotor that has warped. A. Who is right? Checking the diagnostic trouble codes is possible. Ok, im starting a new thread because the problem is not an alignment problem anymore. 1) Caliper Slides The caliper has grooves which secure the brake pads in place and allow the pads to slide inward after you put your foot on the brake pedal. If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. B only Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. The way to prevent these issues is to avoid driving in deep puddles, or areas where salt is used on the roads, but if that isn't an option, be sure to clean the wheels and underside of the car often in winter. What could be the cause of the problem? Steering wheel shakes when brakes are applied. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. a. ABS Diagnostic Trouble Code set One safe way to test whether a braking problem is at the front or rear brakes is to drive at a low speed and: (7.1.2) * low brake fluid All of the following can cause brake pedal pulsation, EXCEPT internal master cylinder leak All of the following can cause brake system dragging, EXCEPT fixed and sliding a. It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. The first step when diagnosing a problem with caliper mountings, slides, and pins is to: The purpose of the lugs on the backing plate is to: On some pads, the depth of the groove is set so: Disc brake pads consist of friction material ________ or _________ onto a steel backing plate (disc brakes).

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